Effects of shallow angle on static strength and fatigue life of multi-directional laminates for wind turbine blades

SungKyu Ha, Alvaro Gorostidi Martinez de Lece, Carlos Donazar Moriones, Carlos Alberto Cimini Junior, Chengzhu Jin

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The effects of the shallow angle on the static strength and the fatigue life of the multi-directional glass fiber-reinforced plastics for wind turbine blades were presented based on experimental results and predictions. The static tests and the tension–tension fatigue tests under cyclic fatigue loads with a stress ratio of 0.1 were performed on bi-axial (BX, [±θ]), tri-axial 1 (TA, [0/±θ2]), and tri-axial 2 (TX, [02/±θ]) laminates with ply angles θ of 25°, 35°, and 45°. A multiscale approach was applied to predict the static tensile and compressive strengths and the S–N curves of BX, TA, and TX laminates based on the constituents: fiber, matrix, and interface. Three ply-based failure criteria (Hashin, Puck, and Tsai–Wu) were also employed to predict the static strength and compare with the experimental results. The predictions and the experimental results show that the tensile strength increases as θ becomes shallower, while laminates with a shallow ply angle of 35° showed similar or even lower compressive strengths, especially for TA and TX laminates. The laminate fatigue life increases as θ becomes shallower. The shallow angle effect on strength and fatigue life is greater for BX than TA and TX laminates since the ply angle θ plays a more important role in BX. By using the multiscale approach, the shallow angle effect on the laminate static and fatigue behaviors were also explained based on the ply stresses as well as the constitutive micro stresses.

Original languageEnglish
Pages (from-to)2549-2563
Number of pages15
JournalJournal of Composite Materials
Volume51
Issue number18
DOIs
StatePublished - 2017 Aug 1

Fingerprint

Wind turbines
Turbomachine blades
Laminates
Fatigue of materials
Compressive strength
Tensile strength
Glass fiber reinforced plastics
Loads (forces)
Fibers

Keywords

  • Wind turbine blade
  • bi-axial and tri-axial laminates
  • fatigue life
  • multiscale approach
  • shallow angle

Cite this

Ha, SungKyu ; de Lece, Alvaro Gorostidi Martinez ; Donazar Moriones, Carlos ; Cimini Junior, Carlos Alberto ; Jin, Chengzhu. / Effects of shallow angle on static strength and fatigue life of multi-directional laminates for wind turbine blades. In: Journal of Composite Materials. 2017 ; Vol. 51, No. 18. pp. 2549-2563.
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Effects of shallow angle on static strength and fatigue life of multi-directional laminates for wind turbine blades. / Ha, SungKyu; de Lece, Alvaro Gorostidi Martinez; Donazar Moriones, Carlos; Cimini Junior, Carlos Alberto; Jin, Chengzhu.

In: Journal of Composite Materials, Vol. 51, No. 18, 01.08.2017, p. 2549-2563.

Research output: Contribution to journalArticle

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